musescore/MuseScore — pull request #1451 by MarcSabatella (2014-11-12 04:58:41+00:00)
Title: fix #38891: phantom measures after delete all in continuous view

As I mention in the issue report, I don't fully understand what is going on, but I can see that we need to clear the bspTree and aren't. So I decided to try passing in 0 for h and/or w in cases where there are no systems and/or measures. It works in the tests I did, and still fixes the crashes that the code I am replacing was designed to fix (as far as I can tell).